Carbureter.



c. LL SHEBPY. CARB'URETEB, APPLICATION F| LED AUG-6| Hi2- Patented Jan.30, 191.7.

2 SHEETS-SHEET I. P

C: L. SHEPPY. CARBUBETER. APPLICATION min n.5, 1912.

2 SHEETS-SHEET 2 R 9 0 3 m M m M P.

UNITED STATES PATENT OFFICE.

bHARIiES L. SHEPPY, OF BUFFA LO, NEW YORK, ASSIGNOB TO THE PIERCE-ARROWMOTOR CAR COMPANY, OF BUFFALO, NEW YORK.

CARBURETER.

" lToalZ whom it may concern:

Be it'known that I, CHARLES L. SI-LEPIY, citizen of. the United States,residing at Bufi'al'o, in the county of Erie and State of New York, haveinvented a new and useful niprovement in" (iarburcters, of which thechewing is a specification.

This invention relates more particularly that type of carburetors forinternal comustion engines which are'provided with no or moresupplemental nozzles for inra'sing'the supplyof' fuel in the explosivemixture as the speed: of the engine increases. With thevordinarycarburetors having a nigle fuel discharge-nozzle, it is extremely Zdifficult, if not impossible,'to obtain an exlosive mixture of correctproportions of 'airfand gasolene for all engine'speeds, especially 1nthe case of "engines having a 'nsiderable range of speed. 7 The mixturenot rieh enough forlhigh speeds and it sftoo 'rich for low speedsAttempts have -been"made to overcome this difficulty by {providing asupplemental fuel discharge nozzle which is brought into action either-inanu'ally or automatically by the increase ing suction as the enginespeeds up. The "imanually controlled carburetors are objec- "ao're'luirehand adjustment for dill'erent speeds. The carbureters heretofore made,in which the action of the supplemental tion of the ,engine, are opento various practic-pl objections. In those in which an auxiliary airvalve is arranged between the su pplcmental gasolene nozzle and thethrottle valve, a perceptible period of time el" pses bctwecn theopening of the auxiliary a rvalve and the commencement of the dischargeof gasolene by the supplemental nozzle, and this arrangement results inan illiperfeet and undesirable action of the carfl burctcr." Theproportion of gasolene in the 'mixture is too high until the auxiliaryair 5 valve opens. and the mixture is then diluted. or '\\eal cnedunlilthe supplemental nozzle starts to discharge and correct the error. When.the supplemmital nozzle starts to dis-- charge, the proportion ofgasolene is end deuly increased and the mixture remains too hmuy untilthe speed of the engine is con sidcrab] y increased. Thus the regulationof the mixture is not in strict accordance with 65 the gradually varyingdemands due to the I tionable because they are not automatic andSpecification of Letters Patent.

gaswlenc nozzle isdependent upon the suc- Patented Jan. 30, 1917.

Application filed August 6, i912. Serial No. 713,677.

increasing speed .of the engiucm In other prior constructions theauxiliary air valve and supplemental fuel nozzle are so con? structedand arranged as to cause a sudden objectionable increase in the air andfuel supply instead of the gradually increasing supply necessary to thesuccessful operation of motors having a considerable range of speed.

The object of this invention is to produce a. thoroughly practical andeflicient carburetor having, main and supplemental fuel supply nozzleswhich will operate auto matically so as to insure an explosive mix.-ture of proper proportions at all speeds of the engine, and in which themain fuel nozz'le can be adjusted to supply a small enough amount offuel to produce good running at slow speeds, the supplemental nozzlebeing relied upon to supply the additional fuel necessary for fasterspeeds? This is accomplished by providing the carbureterwith a main fuelnozzle which is located in the main air inlet passage and supplies thefuel foiwslow speed running, and a supplemental fuel nozzle which islocated between the auxiliary air valve and the throttle valve,preferably at a higher level than the main nozzle, and comes into actionto supplement .the supply from the main nozzle only when the suction ofthe engine is great enough to open the auxiliary air valve.

In the accompanying drawings consisting of two sheets: Figure 1 isasectional elevation in line 11, Fig. 2, of a carbureter em' bodying theinvention. Fig. 2 is a sectional elevation thereof in line 2 2, Fig. 1.

Like reference characters refer to like parts in the several figures;

A represents the constant level gasolene or float chamber of theca'rbureter, B the valve actuated by an annular float C in the floatchamber for controlling the level of gasolene in the float chamber, Dthe main air inlet. passage; E the main gasolcne supply nozzle locatedin a contracted portion of the air inlet passage and communicating bypassages c with the float chamber, c the adjustable needle valve of thenozzle, F the auxiliary air inlet passage controlled by the auxiliaryair admission valve G, H

the air and gasoleue mixing chamber to which. the main and auxiliary airinlet passages lead and which connects by a (118- eharge passage I with.the engine, and K the throttle valve, located between the gasolenenozzles and the discharge passage I, preferably in the inixing'chamberH. While these parts are preferably constructed and arranged as shown inthe drawings and, with the exception of the auxiliary air valve, aresubstantially the same as disclosed in United States Patent No. 943,242,granted Dec. 14, 1909, to Fergusson and Sheppy, assignors, thisconstruction is not necessarily essential to the invention and the partscould be of other suitable construction and arrangement f The auxiliaryair valve preferably 0on sists, as shown,of two or more spring strips orreeds g controlling slots or openings g j opening movement of the reeds.

in the walls of an incio'sing casing. These reeds have dillerent degreesof resiliency, so that they are opened one after another as the suctionincreases and thus effect a gradual admission of the air.

9 are spring tongues for limiting the v The admission openingsaresurrounded by a fine mesh screen 5 for preventing the entrance ofdust.

L represents the supplemental gasolene'or fuel nozzle which is connectedby a suitable passage Z with the float chamber and is arranged with itsdischarge orifice at a point between the auxiliary air admission valveand the throttle valve, preferabl in the auxiliary passage F, and at asuita le elevation above the discharge orifice of the main nozzle E. Thedischarge from this nozzleis controlled by an adjustable needle valve Zwhich for convenience passes upwardly through the carbureter casing andis provided at its upper end with a head for turnin it. 2 indicates aspring detent engaging the serrated head of the needle valve forreleasably holding it in adjusted positions.

The supplemental nozzle can be constructed and arranged between theauxiliaryair valve and the throttle valve in any suitable way, and anysuitable regulating; valve, therefore can be used.

\Vhen the engine is running slowly the auxiliary air valve remainsclosed and the air passes up through the main air inlet iassa e D astthe main asolene nozzle E v so that the gasolcne is caused to flowforcibly from this nozzle by the suction and mixes with the air as itpasses through the throttle valve and mixing chamber in the usualmanner. As the throttle valve opened wider and the engine speeds up. theincreased suction opens the auxiliary air valve and air is taken inthrough'this valve and the passage F above the main nozzle. This reatersuction, together With the action 0 the air in flowing through thepassage F past the sup plemental nozzle. draws msolene from this nozzle,in additici to ,l-fxii iiluil'lg supplied by the main nozzle E, therebyfurnishing the increased quantity of gasolene required for higher speedsof the engine. This arrangement enables the supply from the mainnozzle'to be adjusted small enough to insure good running at slowspeeds, the supple mental nozzle serving it supply the additionalgasolenenecessary for faster speeds.

By reason of .thedescribed location of the supplemental nozzle betweenthe 'throttle valve and the auxiliary air admission valve having aplurality of admission ports which areopened one after another as thesuction increases, the supply of gasolene is increased gradually inaccordance with the increasing speed of the engine, and the mixturewill.

speeds and too lean fuel chamber, a plurality of auxiliary air'admission valves which are opened in succession by the suction of theengine with which the carbureter is connected, at supplcmentalfuel-Suppl nozzleiarranged 1n the path of the air a itted by saidauxiliary air valves, said supplemental fuel'no'z zle being connected atits inlet end only with said fuel chamber and adapted to dischargefuelonly, the discharge end of said supplemental fuel nozzle bein at ahigher elevation than that of the main fuel supply nozzle and constantlyopen, and a throttle valve located between both of said fuel nozzles andthe discharge passage of the carburetcr for controlling the mixture fromboth ofsaid fuel supply nozzles.

2. In a carburetor, the combination of a liquid fuel chamber, means'formaintaining asubstantially constant fuel level therein, main andauxiliary air supply passages, a fuel nozzle arranged in the mam airsupply passage and connected with said fuel chamber, a plurality ofvalves which control the admission of air to said auxiliary air passageand are opened in succession by the suction of the engine with which thecarburcter is connected, a supplemental fuel su ply nozzle connected atits inlet end 0 y with said fuel chamberand adapted toidischarge fuelonly. the discharge end of said supplemental fuel nozzle being locatedin -said auxiliary air passage and at a higher elevation thatthedischarge end of the main fuel supply nozzle and constantlyopen,adjustable means for regulating the maximum discharge ofsaidsupplemental fuel nozzle and a throttle valve located between bothof said fuel nozzles and the discharge passage cf the carburemr forcontrolling the mixture from both of said fuel supply nozzles.

3. In a carbureter,-the combination of a, liquid uel chamber, means formaintaining autis llj constant fuel level therein, supply nozzlearranged in a main air passage and connected with said fuel '3 pluralityof auxiliary air a d :n values consisting of independently n oivrblespring strips oi? different tensions whit-here opened in succession bythe suction of the engine with which the carburetef is connected, asupplemental fuel supply nozzle arranged in the path of the air'admittedby said auxiliary air valves, said suppleniental fuel nozzle beinconnected at its inlet end only with saiduel chamber and adapted todischarge fuel only, the discharge end of said su iplemontal i'nelnozzle being at :1V higher elevation than that of the main fuel supplynozzle and constantly open, and a throttle Valve located between both of:0 said fuel supply nozzles and the discharge passage. of the carburetorfor controlling the mixture from both of said fuel supply nozzles.

' Witness myhand this 29th day of July, :5 1912.

CHARLES L. SHEPPY.

Witnesses:

' "WILLIAM H. Looms,

M. G. EWALD.

